Crystal structure, ionic conductivity and lithium-ion diffusion pathway in a La–Li–Co–O system

Tsuyoshi TAKAMI; Yoshihisa ISHIKAWA; Masao YONEMURA; Toshiharu FUKUNAGA; Eiichiro MATSUBARA; Takeshi ABE

doi:10.2109/jcersj2.19233

Feature: Cutting edge research on electroceramics 2019: Full papers

Crystal structure, ionic conductivity and lithium-ion diffusion pathway in a La–Li–Co–O system

Tsuyoshi TAKAMI, Yoshihisa ISHIKAWA, Masao YONEMURA, Toshiharu FUKUNAGA, Eiichiro MATSUBARA, Takeshi ABE

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Keywords: Solid electrolyte, Oxide, Lithium-ion battery, Band insulator, Lithium-ion conduction

JOURNAL FREE ACCESS

2020 Volume 128 Issue 8 Pages 453-456

DOI https://doi.org/10.2109/jcersj2.19233

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Abstract

Oxide electrolytes are a growing topic in battery research, but their full potential has not yet been realized owing to the lack of new materials. As opposite to the traditional design strategy that relies on d⁰ or d¹⁰ systems, we focus our attention on 3d⁶ systems, oxygen-excess La₂₋_yLi_xLi_0.5Co_0.5O_4.25 and oxygen-deficient La_4/3−_xLi₃_x₊_yLi_0.5Co_0.5O_4−δ. Among them, we achieve lithium-ion conduction in La_1.24Li_0.57Li_0.5Co_0.5O_3.15. A quasi-one dimensional pathway for lithium diffusion or distortion of lithium nuclear density is confirmed to be present at 100 °C by analyzing neutron powder diffraction data in combination with the maximum entropy method.

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